USER
MANUAL
MODEL 2011
High Speed
Asynchronous to
Synchronous
Converter
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
http://www.patton.com
Part# 07M2011-A
Doc# 062021UA
Revised 03/16/94
1.0 WARRANTY INFORMATION
Patton Electronics warrants all Model 2011 components to be
free from defects, and will—at our option—repair or replace the product
should it fail within one year from the first date of shipment.
This warranty is limited to defects in workmanship or materials, and
does not cover customer damage, abuse or unauthorized modification.
If this product fails or does not perform as warranted, your sole
recourse shall be repair or replacement as described above. Under no
condition shall Patton Electronics be liable for any damages incurred
by the use of this product. These damages include, but are not limited
to, the following: lost profits, lost savings and incidental or
consequential damages arising from the use of or inability to use this
product. Patton Electronics specifically disclaims all other warranties,
expressed or implied, and the installation or use of this product shall be
deemed an acceptance of these terms by the user.
1.1 RADIO AND TV INTERFERENCE
The Model 2011 generates and uses radio frequency energy, and if
not installed and used properly—that is, in strict accordance with the
manufacturer's instructions—may cause interference to radio and
television reception. The Model 2011 is designed to provide
reasonable protection from such interference in a commercial
installation. However, there is no guarantee that interference will not
occur in a particular installation. If the Model 2011 does cause
interference to radio or television reception, which can be determined
by disconnecting the RS-232 interface, the user is encouraged to try to
correct the interference by one or more of the following measures:
moving the computing equipment away from the receiver, re-orienting
the receiving antenna and/or plugging the receiving equipment into a
different AC outlet (such that the computing equipment and receiver are
on different branches).
1.2 SERVICE
All warranty and non-warranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
Technical Service at (301) 975-1007.
Packages received without an
RMA number will not be accepted.
Patton Electronics' technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Model 2011. Technical Service hours: 8AM to 5PM EST, Monday
through Friday.
1
2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is
warranted for One Year parts and labor. If any questions or problems
arise during installation or use of this product, please do not hesitate to
contact Patton Electronics Technical Support at (301) 975-1007.
2.1 FEATURES
• Conforms to CCITT V.22 and V.14 standards
• Lets asynchronous terminals communicate with synchronous
modems and multiplexers
• Accepts character lengths to 11 bits
• Requires no AC power or batteries
• Supports data rates to 64 Kbps
• Automatically adjusts synchronous data rates
• Miniature size
• Plugs directly into async. or sync. DB-25 port
• Accepts external clocking
• Made in the USA
2.2 DESCRIPTION
The Patton Model 2011 asynchronous to synchronous converter
plugs directly into a local asynchronous DTE (terminal, PC, etc.) and
connects that DTE, via RS-232 cable, to a synchronous DCE. When
the same set-up is installed on the remote end, the local and remote
DTEs can communicate over the synchronous link.
Drawing power from either the synchronous or asynchronous
RS-232 interface, the Model 2011 needs no AC power or batteries to
operate and supports RS-232 data rates from 64 Kbps. Because the
Model 2011 automatically adjusts the synchronous data rate to match
the asynchronous DTE’s output rate, no data rate strapping is
necessary. The Model 2011 derives clocking externally from the clock
of the synchronous DCE, and imposes no limit on data block size.
Characters may be up to 11 bits long.
Measuring only 3.2” x 2.0” x .75”, the Model 2011 is housed in a
sturdy ABS plastic case. It comes fully equipped with a DB-25 male
connector and a DB-25 female connector, which plug directly into the
synchronous and asynchronous ports.
2
3.0 CONFIGURATION
The Model 2011 is configured using internal DIP switches. Figure 1
shows the location of the Model 2011's configuration switches.
3.1 ACCESSING INTERNAL SWITCHES
The Model 2011's DIP switches are mounted on the PC board. To
access the PC board, insert the blade of a small flathead screwdriver
into the slot on one side of the Model 2011’s case, then pop the case
open by twisting the blade. Repeat on the other side of the case. You
should now be able to pull the case halves apart and access the DIP
switches on the PC board. Once you have set the switches properly,
align the case halves and snap them together.
3.2 SETTING INTERNAL SWITCHES
Three DIP switches are used to configure the Model 2011: two
switches set the character length and one switch matches the signaling
rates of the asynchronous and synchronous ports. Figure 2 shows the
orientation of the DIP switches.
3.2.1 CHARACTER LENGTH
Switches SW1-1 and SW1-2 operate jointly to set the
asynchronous character length. The asynchronous character length
setting is determined by combining the number of start, stop, data and
parity bits that make up each character generated by the asynchronous
DTE. The Model 2011 does not care about the composition of each
asynchronous character, only its length is significant. Below are the
combined switch settings that set the four possible asynchronous
character lengths:
SW 1-1
SW 1-2
8 Bit OFF ON
9 Bit ON ON
10 Bit OFF* OFF*
11 Bit ON OFF
3.2.2 EXTENDED SIGNALING RATE (ESR)
The position of switch SW1-3 ensures that the asynchronous input
data rate matches the synchronous output data rate. When switch
SW1-3 is set to OFF, the asynchronous bit rate must match the
synchronous clock rate to a tolerance of -2.5% to +1%. When switch
SW1-3 is set to ON, the asynchronous bit rate must match the
synchronous clock rate to a tolerance of -2.5% to +2.3%.
SW 1-3
-2.5% to +1% OFF*
-2.5% to +2.3% ON
* Default settings
Note: Switch SW1-4 is not used.
4
Configuration
Switches
Async. Female Connector
Sync. Male Connector
3
OFF
ON
OFF
OFF
ON
ON
ON
OFF
Figure 1. Switch locations on the Model 2011 PC board
Figure 2. DIP switch orientation
4.0 INSTALLATION
The Model 2011 is designed to be used
in pairs
, with one unit
installed between an asynchronous DTE and a synchronous DCE on
either end of a synchronous communication link. Figure 3 illustrates a
typical Model 2011 installation.
4.1 CONNECTING THE ASYNCHRONOUS PORT
The asynchronous port of the Model 2011 is a DB-25 female and
is configured as "DCE". Therefore it wants to talk to a DTE device such
as a terminal or PC. The Model 2011 may be plugged directly into the
DB-25 serial port of a DTE or connected via "straight through" cable.
4.2 CONNECTING THE SYNCHRONOUS PORT
The synchronous port of the Model 2011 is a DB-25 male and is
configured as "DTE". Therefore it wants to talk to a DCE device such
as a modem or multiplexer. The Model 2011 may be plugged directly
into the DB-25 serial port of a DCE or connected via "straight through"
cable.
APPENDIX A
PATTON MODEL 2011 SPECIFICATIONS
Data Rates: Up to 64 Kbps
Clocking: Provided by modem or multiplexer
Buffer: 4 bit RTS override feature empties buffers
before dropping RTS
Data Transmission: Full or half duplex
Connectors: DB-25 female on asynchronous port, DB-25
male on synchronous port
Power Supply: None required; uses power from data and
control signals
Temperature Range: 0-60°C (32-140°F)
Altitude: 0-15,000 feet (0-5,000 meters)
Humidity: 5 to 95% noncondensing
Dimensions: 3.2" x 2.0" x 0.75"
Weight: 2 oz. (56.8 grams)
5 6
Async. DTE
Model 2011
Sync. DCE
Async. DTE
Figure 3. Typical Model 2011 application
APPENDIX B
ASYNCHRONOUS PORT CONNECTIONS
(CONFIGURED AS "DCE")
Pin Name Description
1 FG Frame Ground; connected straight to synchronous
port
2 TXD Transmit Data (to 2011); data input from asynchronous port;
Input to the 2011 power supply
3 RXD Receive Data (from 2011); data output to asynchronous port
4 RTS Request to Send (to 2011); input to the power supply
5 CTS Clear to Send (from 2011); connected straight through to
synchronous port
6 DSR Data Set Ready (from 2011); connected straight through to
synchronous port
7 SG Signal Ground; connected straight through to
synchronous port
8 CD Carrier Detect (from 2011); connected straight through to
synchronous port
9 +DCV Connected straight through to synchronous port
10 -DCV Connected straight through to synchronous port
20 DTR Data Terminal Ready (to 2011); input to power supply
22 RI Ring Indicator (from 2011); connected straight through to
synchronous port
APPENDIX C
SYNCHRONOUS PORT CONNECTIONS
(CONFIGURED AS "DTE")
Pin Name Description
1 FG Frame Ground; connected straight to asynchronous
port
2 TXD Transmit Data (from 2011); data output to synchronous port
3 RXD Receive Data (to 2011); data input from the synchronous port
input to 2011 power supply
4 RTS Request to Send (from 2011); 4 bit delay from asynchronous
port (2011 waits 4 bits before dropping RTS to the
synchronous port; this facilitates use in a polling
environment)
5 CTS Clear to Send (to 2011); connected straight through to
asynchronous port
6 DSR Data Set Ready (to 2011); connected straight through to
asynchronous port
7 SG Signal Ground; connected straight through to
asynchronous port
8 CD Carrier Detect (to 2011); connected straight through to
asynchronous port
9 +DCV Connected straight through to asynchronous port
10 -DCV Connected straight through to asynchronous port
15 TXC Transmit clock (to 2011); used to synchronize data conversion
from 2011 to synchronous port
17 RXC Receive clock (to 2011); used to synchronize data conversion
from 2011 to synchronous port
20 DTR Data Terminal Ready (from 2011); input to power supply
22 RI Ring Indicator (to 2011); connected straight through to
asynchronous port
7 8
APPENDIX D
BLOCK DIAGRAM
9
RTS-A
DTR
20
SUPPLY
TD_1
RD_2
234
POWER
ASYNC PORT
7
GND
DB25FEMAL
3 LEVELRD
RTS-A
CONVERTER
2
TD_1 TDI
E
-V
REGULATOR
+5V
Date: May 11, 1994 Sheet 1 of 1
Size Document Number REV
Title
MODEL 2011 HIGH SPEED ASYNC SYNC CONVERTER
A 062021B A
PATTON ELECTRONICS
+V
+5V
SETTINGS FOR
DIP SWITCH
LENGTH/ERR%
RDO
P L L
16X CLOCK
RST
COUNTER
RIPPLE
Q2
SYNC PORT
ASYNC <> SYNC
CONVERTER
TXC
RDI
CONVERTERRXC
LEVEL
RD_2
RXC
TXC
3217154RTS
DB25MAL
E
TDO
TD
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